Antenna



FIG. 1 is a front perspective view of an antenna showing my new design;

FIG. 2 is a front perspective view thereof, shown with the upper portion in a first alternate position;

FIG. 3 is a front perspective view thereof, shown with the upper portion in a second alternate position;

FIG. 4 is a rear and left side perspective view thereof, shown with the upper portion in the first alternate position;

FIG. 5 is a rear and left side perspective view thereof, shown with the upper portion in the second alternate position;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a rear perspective view thereof. 

The ornamental design for an antenna, as shown and described. 